package top.shiyiri.community.bean;

/**
 * @author Aunean
 * @date 2022/3/13 20:23
 */

import lombok.Data;

/**
 * 分装分页相关的信息
 */

public class Page {
    //当前页码
    private int current = 1;
    //显示上限
    private int limit = 10;
    //数据的总条数
    private int rows;
    //查询路径
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if (current >= 1) {
            this.current = current;
        }

    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if (limit >= 1 && limit <= 100) {
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     * @return
     */
    public int getOffset() {
        // current * limit - limit
        return (current - 1) * limit;
    }

    /**
     * 获取总页数
     */
    public int getTotal() {
        // rows / limit
        int total = rows % limit == 0? rows / limit: rows / limit + 1;
        return total;
    }

    /**
     * 获取起始页码
     * @return
     */
    public int getFrom() {
        int from = current - 2;
        return Math.max(from, 1);
    }

    /**
     * 获取结束页码
     */
    public int getTo() {
        int from = current + 2;
        return Math.min(getTotal(), from);
    }
}
